Burglar-alarm.



No. 700,897. Patented May 27, |902.

J. u. A. CATE.

BURGLAR ALARM.

(Application med Jan. 1o, 1902.; (No Model.) 2 Sheets-*Sheet I.

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Patented May 27, |902.

BURBLAR ALARM.

(Application. fled.' Ian. 10\ 1902.)

2 Sheets-Sheet 2` (No Model.)

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tioned through the door.

UNTTTD STATES PATENT OFFICE.

JOHN Q. A. GATE, OF ARLINGTON, MASSACHUSETTS.

BURG LAR-ALARM.

.SPECIFICATION forming part of Letters Patent No. I700,897', dated May 27, 1902.

Application led January 10, 1902. Serial No. 89,125. (No model.)

1o which may be readily attached to either a window or door, so that by opening the window or door with which it is connected the alarm will be sounded.

The invention will now be fully described 15 by reference to the accompanying drawings,

and the several novel features thereof will be particularly pointed out in the claims at the close of the specification.

In the drawings, Figure 1 is a front elevazo tion of a device embodying the invention attached to a door. Fig. 2 is a side elevation viewed from the right of Fig. 1, sectioned through the door-jamb. Fig. 3 is aside elevation viewed from the left of Fig. 1, sec- Fig. 4 is a top plan of the device. Fig. 5 is a plan showing the device attached to the top rail of the lower sash of a window, the device when so attached being in such position that a plan will show 3o the same view of the device as a front elevation when attached to a door. Fig. 6 is an end elevation of Fig. 5, partly broken away.

1 represents a box or casing for the mechanism of an ordinary alarm-bell, in which 2 is the arbor, 3 the mainspring, 4 the escapespring from unwinding to actnate the alarm.

A spring 15, connected with said lever 13, tends to hold the lever in such position that the ange 14 will stand out from the front of the box far enough to prevent engagement ofY 5o the catch-pin 8, and the rear projection of the lever will extend back beyond the rear face of the box. A slotted plate 1G serves as a guide for the lever 13 and also as a stop to plates 17 13, adjustably secured together and having at their outer ends, respectively, jaws 19 20. Plate 17 is made fast to the box and is formed with an elongated slot 2l, through which pass the rivets 22, which connect the plate 1S with the angle-bar 23. A screw-bolt 24 passes through the outer arm of angle-bar 23 and through a screw-plate 25, secured to the wall of the box. By turning the bolt the angle-bar 23, and thereby the movable plate 18, may be moved in or out as desired to vary the breadth of grip. A convenient means of turning the bolt 24 is to form the end with a stem 26 and have a key which will iit the stem, preferably having the siem 2G` the same size as the stem of the arbor 2, so that the same key which is used for winding the spring may be employed to turn the bolt. When the device is applied to a door, it is clamped to the stile 27, as shown in Fig. 1, so that the lever 13 will press against the jamb 35 when the door is closed, the lever thereby being turned so as to hold the flange 14 in toward the box, so that the catch-pin 8 will be engaged in the hole 28 and prevent the alarm from going off, as already described. When the door is opened, it draws the lever 13 away from the jamb and leaves it free to respond to the pressure of the spring 15, which thereby turns the lever and lifts the flange 14 away from the catch-pin 8 and allows the mainspring 3 to actuate the alarm mechanism. Only a very slight opening is necessary to set the alarm in operation. A safety-lever 29 is pivoted to the box, which may be turned so as to engage the catch-pin, if desired, when the arm 13 is not engaged with it, so as to prevent the alarm from act ing. The safety-lever 29 also serves to move the catch-arm 8 intoposition to enter the hole in the flange 14 when the device .is set. In iitting the device to a window the same clamping mechanism may be employed. The box is set on the top rail 30 of the lower sash of thewindow, one jaw 19 passing between the IOO top rail 30 of the lower sash and the bottom rail 31 of the upper sash. As the sash-rail is usually narrower than the stile of the door, in order to adapt the same device for application vto either a door or a window an extensionblock 32 is preferably employed having thin metal flanges 33, secured thereto, which project onto the top rail 30 of the lower sash, and the jaw 2O of the movable plate will engage the outer edge of said block 32, and when the jaws are set up the block will be clamped, with the box, to the window. The said block is separate from both the Window and the alarmboX, but requires no other fastening than the clamp. The end of lever 13 will press on the bottom rail of the upper sash and keep the alarm from striking while the window remains closed, as when iitted to a closed door. If the upper sash is lowered or the lower sash is raised, it will release the lever 13, so that the spring 15 will turn said lever to release the' catch-pin in the manner previously described and the alarm will strike.

Upon closing the door after the alarm has been set in operation by opening the door the lever will again engage the jamb and cause the detent to shut oif the alarm.

What I claim is- 1. In combination with a gong or bell, a striker, mechanism for actuating the striker, a housing therefor, a bent lever one arm of which is journaled in bearings attached to the housing, and provided with a catch which is adapted to engage with the striker-actuating mechanism to hold it in restraint, a spring which tends to hold the lever in a position for the catch to be disengaged when the lever is free to respond to the spring and with the unjournaled arm of said lever extending diagonally rearward beyond the rear face of the housing in such manner that when the housing is attached to a door or to one sash* of -a window the rear end of said lever may be caused to engage with the jamb of the door or with the opposite sash of the window when the door or window is closed and hold the lever against the tension of its spring in position to cause the catch to restrain the striker, said spring turning the lever and disengaging the catch when the dooror windowis opened, substantially as described.

. 2. In combination with a gong or bell, a striker, mechanism for actuating the striker, a housing therefor, a bent lever one arm of which is journaled in bearings on the housing, and provided with a catch which is adapted to hold the striker mechanism in restraint, a spring which tends to hold the lever in a position for the catch to be released, and an adjustable clamp whereby the device may be clamped to a door or to a Window-sash with the free end of the lever bearing upon the door-jamb or upon the opposite window-sash while the door or window is closed thereby causing the catch to restrain the striker, the lever being freed by the opening of the door or window so that it responds to the action of the opening and releases the catch, the clamp holding the device on the door or window both when closed and open, substantially as described.

3. In combination with a gong or bell, a striker, mechanism for actuating the striker, a housing, a bent lever 'one arm of which is journaled in bearings in the housing, a detent on the lever which is adapted to engage the striker mechanism, the unjournaled arm of the lever extending rearwardly of the housing, means for fastening the housing to the stile of a door or the rail of a window-sash, the projecting free end of the lever pressing upon the door-jamb or upon the opposite sash when the door or window is closed thereby turning the lever in its bearings and causing the detent to hold the striker in restraint, and a spring which when the door or window is opened will turn the lever in the opposite direction and release the detent, substantially as described.

4. In combination with a gong or bell, a striker, mechanism for actuating the striker, a housing, a bent lever one arm of which is journaled in bearings in the housing, a flange on said arm having a slot which is adapted to engage with a pin connected with the striker-actuating mechanism and hold it in restraint, I[he unjournaled arm of the said lever extending rearwardly of the housing, means for fastening the housing to the stile of a door or the sash of a window, the projecting free end of the lever pressing upon the door-jamb or upon the opposite sash when the door or window is closed, thereby holding vthe lever in a position 'where the said slot will engage the said pin, and a spring which when the door or window is opened will turn the lever in its bearings and release the striker mechanism, substantially as described.

5. In combination with a gong or bell, a striker, mechanism for actuating the striker, a housing, a bent lever one arm of which is journaled in bearings in the housing, a detent on the lever which is adapted to engage the ICO IIO

striker mechanism, the unjournaled arm of the lever extending rearwardly of the housing, means for fastening the housing to a door or to a window-sash, the projecting free end of the lever pressing upon the door-jamb or upon the opposite window-sash when the door is closed thereby holding the detent in IZO engagement with the striker-actuating mechb 

